How to use
- Enter the two numbers in the order you want to calculate. Use ordinary digits without commas, spaces between digits, decimal points or signs. Zero is accepted; initial zeros are removed from the working after calculation.
- Choose Calculate or press Enter in either input. The result shows an exact answer, a vertically aligned calculation and numbered steps. Each column is labelled by its place value: 1, 10, 100 and so on.
- Open any step to see its working. Small numbers in the separate Carry or Regrouped row are annotations, not extra digits attached to the original number. The highlighted cell identifies the place being worked on. On a small screen, scroll only the calculation horizontally.
- Copy result copies the equation and the numerical explanations as plain text. It does not copy an image of the grid. Editing either number immediately clears the old result and disables Copy; calculate again to confirm the new inputs. Clear empties both fields.
How the calculation works
For each digit of the second number, multiply every digit of the first number from right to left. Add the incoming carry, write the ones digit and pass the tens onward. The resulting partial product is multiplied by 10 for each place to the left: a tens digit contributes ten times its single-digit product. Zero digits still get a partial-product row. Finally add all aligned partial products, showing the addition carries as well.
10⁰ = 1 · 10¹ = 10 · 10² = 100 · 10³ = 1000
Worked examples
Try 247 × 36. The ones row is 247 × 6 = 1482. The tens row is 247 × 3 × 10 = 7410. Add 1482 + 7410 to obtain 8892. For 205 × 104, the rows are 820, 0000 and 20500: the middle row deliberately retains the zero tens contribution. Their sum is 21320.
Uses and limits
Use the working to check homework, explain a written method or locate a missed carry. Compare one column at a time with your own work; the answer alone cannot reveal which step went wrong. Each input is limited to eight digits, including any initial zeros. There is no expression parser, decimal arithmetic, signed-number mode or saved calculation history. All digits of the exact integer answer are retained; they are not rounded to two decimal places.
Frequently asked questions
Why are the numbers aligned to the right?
The rightmost digit is the ones place. Aligning this column also aligns every power of ten, so each operation combines matching place values. In multiplication, appended zeros mark the place-value shift of each partial product.
What happens with zero or equal numbers?
Adding zero leaves the other number unchanged. Subtracting equal numbers gives zero, and multiplying by zero gives zero. Subtraction requires the first number to be at least the second; the calculator explains that restriction instead of silently swapping your inputs.
Why did my previous answer disappear?
An edited input no longer matches the old calculation. Recalculate to display a fresh answer and enable Copy. Refreshing or changing the page language does not preserve this calculation, so copy anything you want to keep first.